Environmental

Radon is a particular concern in South Dakota because:

AThe state has many coastal properties
BThe geology of South Dakota includes uranium-bearing soils that naturally produce radon gas✓ Correct
CIndustrial activity produces radon as a byproduct
DSouth Dakota has the highest radon levels in the nation by law

Explanation

South Dakota has elevated radon levels due to its uranium-bearing granite and soil geology, particularly in the western Black Hills area. Radon testing is strongly recommended for all SD properties.

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